Nexus Repository Manager Behind an HTTP Proxy

If you are trying to run Nexus Repository Manager behind an http proxy server that requires NTLM authentication, then you have issues with it because the httpclient version that nexus uses is problematic about NTLM authentication.

There are some http proxy configuration parameters on Administration/Server view. I configured the proxy settings as below and filled the NTLM fields according to my domain settings but nexus could not reach the repositories through http proxy because of NTLM authentication issues. 

After some googling, I found that there is a workaround for this issue. First we need to download the cntlm authentication proxy and install it.

Extract the content of the cntlm zip file to a temporary location, enter the extracted directory and run the setup.bat that installs the cntlm under the Program Files and registers a new windows service named cntlm. Now we are able to start and stop cntlm service via windows services tool. After the installation of cntlm we need to configure it by editing cntlm.ini file that resides under the ~/Program Files/Cntlm/ folder.

#

# Cntlm Authentication Proxy Configuration

#

# NOTE: all values are parsed literally, do NOT escape spaces,

# do not quote. Use 0600 perms if you use plaintext password.

#

Username okahraman

Domain mydomain

Password mypassword # Use hashes instead (-H)

#Workstation netbios_hostname # Should be auto-guessed

Proxy aproxy:8080

#Proxy 10.217.112.42:8080

#

# This is the port number where Cntlm will listen

#

Listen 3128

Now local authentication proxy is ready and  we need to configure the nexus with the local cntlm proxy.

and we are ready to go with nexus repository manager...